Island



No. s|'3,425. Patented Nov. |,'|89a. N. M. sAATl. DIVIDING MACHINE. (Applicatiog led Nov. 15, 1897.)

(No Model.)

INVEN'T'EIR mz NoRRls page UNITED STATES ATENT Fries.

NOWMAN M. SAATI, OF PROVIDENCE, vRHODE ISLAD.

DlVlDlNG-NIACHINE.

SPECIFICATION forming part of Letters Patent N0. 613,425, dated November 1, 1898.

Application fled November 15, 1897. Serial No. 658,622. l(No model.)

rsubject of the Sultan of Turkey, residing atl Providence,in theState of Rhode Island, have v invented a new and useful Improvement in Dividing-Machin es for Making Toothed Wheels, Dials,and the Like, (patented inEngland December 6, 1895, No. 23,421, and by definitive Swiss patent June 16, 1896, No. l3,633,) of which the following is a specification.

This invention relates to machines for dividing circular articles-such as cog-wheels,

dials, andv the like-With mathematical pre-I cision into equal divisions.

The machines which are actually used for dividing into equal divisions cog-wheels, dials, and the like are generally provided with a disk having a series of circular ranges of notches intended to progressively rotate the articles to be divided in front of the dividing-tool, each of these circular ranges of notches corresponding to one division r to a number of divisions into which the irst one may be divided. Such ranges of notches are generally disposed in concentric circles upon the said disk, and the notches are made deep enough to enable a suitable pin of the dividing-toolto engage the same. Now it has been proved in practice that notwithstanding the exactitude with which such divided disks may have been executed the machines provided With such dividing implement never work mathematically correct, and this is especially noticeable when applied to the division of very small cog-wheels-as, for instance, Wheels for watch-movements.

The object of this invention is to provide a new device intended to replace the abovementioned disks in machines for dividing cogwheels or similar articles and to completely avoid anyand everyinaccuracyin the working of the same and obtain work of mathematical exactness and precision. To that eect I provide a number of sets of two similar index-wheels, each having a range of teeth projecting over one face of the wheel and disposed concentrically around the same, each of these forming a so-called f crown-Wheel and the two wheels of one set having one and the same number of teeth and being divided as exactly as possible. Each set of index-wheels is intended to replace one of the circular lot and b engaging into one another.

ranges of notches with which are provided the well-known dividing-machines mentioned above and to be used for making on the article which is to be divided a certain number of divisions.

The accompanying drawings are schematical illustrations of a dividing-machine constructed according to my invention, in which- 1 Figure 1 is a longitudinal side elevation, partlyin section; and Fig. 2 represents a section taken in the line 2 2 of Fig. 1.

The sets of index-wheels A andB are interchangeable and intended to Work in one and the same manner. I shall therefore consider in the following description only one of them, it being well understood that the number of teeth d and b of the described sets of wheels may be chosen at will, according to the number of divisions which are to be provided on the article to be divided. The said index- Wheels A and B of one set are placed adjacent in front of one another around one and the same axis, with their crown-shaped teeth One of the said index-wheels, A, is fixed to a rotative shaft O, which bears by means of the usual well-known devices--for instance, by means of a screw-nut a: or by means of a clutch of any convenient construction Whatever-the article X to be divided. The second indexwheel, B, is placed concentrically to the axis of the said s haft upon afsleeve D, fixed on a support D', on which/it is adapted to slide axially, suitable means being provided for preventing its being `rotated-for instance, two studs or projections d of the iixed bearing D', to which are affixed the said studs or projections d, projecting eccentrically through the-said wheel B. There are further provided suitable springs E, which tend to press the said sliding wheel B against the Wheel A, fixed on the rotative shaft, which latter is ixed in its axial direction by any well-known suitable means whatever.V There are further provided means for retracting the sliding wheel B out of gear with the fixed wheel A-for instance, by means of a handlever F, having a projection f, engaging a suitable hole of the hub of said wheel B and pivoted at a fixed point of the frame of the machine. The rotating index-Wheel A is IOO therefore prevented from being rotated as long as the fixed or sliding wheel B is pressed into engagement and gears with the same; but the said rotating wheel A may be rotated through a distance of one or more of its teeth as soon as the sliding wheel B is disengaged by means of the hand-lever F or any other suitable means whatever out of gear with the said rotative wheel.

Now it will easily be understood that when the shaft C, carrying the article to be divided and carrying at the same time the rotating index-Wheel A, is rotated progressively by successively disengaging and rengaging the sliding index-wheel B, tooth by tooth, with the rotating index-wheel A the progression of rotation thus obtained will be for each tooth thus disengaged and rengaged quite exact, any and every possible inaccuracy of the division of the teeth of one of the two indexwheels which Work in the described manner being necessarily compensated by its being successively engaged with all the teeth of the other index-wheel. The drawings show, for instance, a cutting-wheel G, intended to cut teeth on the periphery of a wheel X, the said vcutting-Wheel G being supported by two sliding bearings H and I, of usual construction.

It is understood that the teeth of the abovementioned index-wheels may be of any suitable form whatever and that they may be re; placed by a series of pins fixed to one of the said Wheels and engaging a series of holes provided in the other.

I claim as my inventionl. In a dividing-machine, the combination of a toothed index-Wheel fixed on a rotative shaft which bears the object to be divided, with an index-Wheel of corresponding teeth sliding on a sleeve concentric to the said rotative shaft and means for preventing the rotation of the sliding Wheel, the rotative index-wheel being adapted for rotation tooth by tooth in front of the sliding index-wheel to rotate the object to be divided through an angle determined by the number of teeth in the index-wheels, substantially as described.

2.l In a dividing-machine, the combination of a toothed index-wheel, fixed on a rotative shaft which bears the object to be divided, with a non-rotative index-wheel adapted for engagement with several teeth around the circumference of the rotative index-Wheel whereby the error of graduation will be compensated, substantially as described.

NOWMAN M. SAATI.

Witnesses:

SOCRATES ScHoLFrnLD, J AMEs W. BEAMAN. 

